Condição uterina e ovariana no pós-parto e fertilidade no cio do potro em éguas Mangalarga Marchador

• Ano de defesa: 2021
• Autor(a) principal: Hanna Gabriela Oliveira Maia
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; Brasil; ICA - INSTITUTO DE CIÊNCIAS AGRÁRIAS; Programa de Pós-Graduação em Produção Animal; UFMG
• Palavras-chave em Português: equideocultura; reprodução; endométrio; gestação; ovulação; estro; Equino > Reprodução; Equino > Criação; Estro
• Link de acesso: http://hdl.handle.net/1843/37068

The first heat manifested right after the mares' parturition, known as the foal's heat, has lower fertility when compared to the subsequent heats, but it reduces the interval between parturitions and increases the prolificacy per mare. Thus, gynecological control monitored with ultrasound, monitoring of follicular development and uterine involution through clinical observations, measurements of uterine diameter and evaluation of uterine edema and tonicity, can help to understand the physiological changes that occur during the puerperium and onset of heat post childbirth. Thus, it will be possible to elucidate factors compromising the reproductive performance of mares during this period. Therefore, the objective was to evaluate the reproductive condition and the postpartum pregnancy fertility rate of Mangalarga Marchador mares submitted to natural mating in the foal heat. The research was carried out on the premises of the Institute of Agricultural Sciences, Federal University of Minas Gerais, at the Hamilton Abreu Navarro Experimental Farm, located in Montes Claros, MG. Eight mares of the Mangalarga Marchador breed were used. The assessment procedures started two days after delivery, and data were collected between September and December 2019. Ultrasound measurements of follicular and uterine diameters were evaluated using ultrasound during 42 days after delivery. Weight and body condition score were measured one week before delivery and two, 30 and 60 days after delivery. The conception and estrus repetition rates were calculated in order to verify the postpartum reproductive efficiency. Data were submitted to Pearson's correlation analysis, chi-square test and Fisher's exact test (P<0.05), linear and quadratic regression, while the means with standard deviations were calculated in Excel. Ovulation of the evaluated mares occurred 14.5 ± 2.25 days after parturition. The follicular wave had a mean duration of 11.75 ± 2.5 days, with a daily follicular growth rate of 3.6 ± 0.6mm. The corpus luteum regression rate found was 1.12% with a mean regression time of 17 days. A reduction of the uterine body of 20.6 ± 1.4 mm was observed during the 42 days of evaluation, characterizing the process of uterine involution of the mares. A high conception rate was found (75%) and the weight and body condition score before and after delivery were satisfactory. Therefore, follicular dynamics, involution, weight variation and body condition score were compatible with the manifestation of postpartum estrus in Mangalarga Marchador mares and did not interfere in the conception rate.